Warp stop mechanism for looms



iled April l, 1925 ATTORNEY @n n@ www .z @d mm V n N @o mw @www Y Nh mW am, NW Q% WNNN l Q Y m@ NN Y MIN. l u m @M E* m AOS n..

Patented Oct. 13, 1925.

"UNITED STATES CORPORATION 0E MAINE.

IPAT'EN'P oFFica;

GEORGE W. REID, OF LAWRENCE, AND ALFRED DURAND, OE METHUEN, MASS-ACHIL- SETTS, ASSIGNORS TO DRAPER CORPORATION,

OE HOPEDALE, MASSACHUSETTS, A

VVARP ySTOP MECHANSM FOR LOOMS.

.lippiication sied iiprii 1, 1925. serial No. 19,801.

To all wiz-0m t may concern:

Be it known that we, GEORGE W. REID and ALFRED DURAND, citizens of the United States, residing at Lawrence and Methuen, respectively, in the county of Essex and State of Massachusetts, have invented an Improvement inVarp Stop Mechanisms for Looms, of whichthe following description, `in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts. `This invention relates to warp stop mechanisins` for looms, and more particularly to ,that type comprising an arrestable vibrator with lay knock-off.

In warp stopmeclianisms of the above type, it is now customary to provide a dog or fish-tail positionedby arrest of the detector to be` struck by a bunter on the lay to effect loom stoppage upon the occurrence of a warp fault. A warp stop mechanism of this general type is shown and described in D the patent to Carl D.A Brown, No. 1,362,670, December 21, 1920. Since the position of the dog or fish-tail is controlled from the detectoryany turning movement of the dog vor fish-tail during its engagement with the bunter on the lay is liable to transmit to the detector injurious pressure against the drop wire, and since such drop wires arenecessarily-made of light material, injury, frequently `occurs to a drop wire. e l

' An important feature of thepresent` in- )ects apin 27 extending laterally from the vention, therefore,1consists of means for rer lieving the drop wire from injurious pressure by the detector due to movement of the dog or fish-tail when engaged by the bunter onthelay. y 1

The invention and knew combination of parts will best be made kclear from lthe fol- `lowing description and the accompanying drawings of one good form thereof. In the drawings:

. Fig. `1 isa sectional side elevation of a r loom-provided with the present invention;

journaled in suitable bearings in the loom sides. The main parts of the warp stop mechanismv comprise the usual warp supports-6,`

as shown, between which are mo'untedthe `drop kwires 7, which may be `ofany usual type, and herein shown as guidedlin their movements by the'guide bars which pass warpthreads a normally support the drop wires 7 during normal loom operation and to` this end each drop wire is shown as having an opening 10 for the passageof through slots 9 of the drop wir-es." The.`

as usual, through an arm 14connected by a f rod 15 with the lever 16 pivotally supported at 17 `and normally under the infiuence of a spring 18ffor holding the end .19 of the lever yin engagement with a cam 20 on the under or cam shaft 21. These parts may be substantially` the same .as shown and de scribed in, the Brown patent abovementioned.l

. Mounted vin a bearing 22, Fig. 2, which maybe conveniently supported by a bracket 2,3 secured to the loom side is a rock shaft 24l1aving secured-thereto a governor 25 provided with an opening 2,6 into which ypro-` dogorfan-tail 28, which is itself mounted upon the rock shaft 24 for sliding movement relative thereto. The dog 28 has a slot 29 through which the shaft 24 extends, theA construction being such that the dog 28 may be raised or lowered by the governor 25 and may also be moved backward relative to the shaft 24.Y U

Also mounted on the shaft 24: is the head 30 of the knock-off which, like the dog 28, isprovided with a slot whereby it may move lengthwise relative tothe shaft,21, and connected to the head 30 is the knock-ofi' rod 31 to eHeet loom stoppage when the dog, and` perfore the knock-off head, are moved backward relative to the shaft 24. Extending from the dog 28 is a pin 32 which enters a slot 33 in the knock-ofthead, the construction beingl such that should they dog 28v be.,`

moved rearward, as described, the knock-off head will likewise be moved rearward and pull upon the knock-off rod 31. In accordance with the present invention, such pwllli upon the. knock-off rod 31 is utilized to Veftectloom. stoppage, which may be effected by disengaging the shipper from its holding notch or moving it rearward.

In the present instance, the knock-off rod 31 is connected with the shipper 34 by a pin and slot connection as at 35, the shipper itself being pivoted to the loom frame at 36, or, if desired', the same character of shipper knock-off may be employed as shown in the Carl D.A Brown patent,y since the particular details of the knock-oil form no essential part of the present invention.

The lay 2r carries a bunter 37 which is adapted to engage the dog 28 on backward movement of the lay provided the dog has been positioned for engagement by the bunter to thereby effect loom stoppage. The parts so, far described may be of' the same general' construction as shown and described in. the Carl D. Brown patent or such construction m-ay be modified within the true scope of the present invention.

The rock shaft 24' has extendingI therefrom an arm 3.8 and such arm,y in warp stop mechanisms of this general type, is actuated to rock the rock shaftby movement of the detector, in order to carry the dog 28 to aV position that it may not bey engaged by the bunter 37 soV long as the detector partakes of its detecting movement.

Should Vthe dog 28, however, be positioned tor engagement by the bunter when the detector is arrested in its detecting movement by a drop wire, it is liable at this time to be vgiven a turning movement as well as its backward movement to eiiect loom stoppage, and such turning movement ofthe d'og will be transmitted to the detector and 'increase the pressure thereof against the drop wilre. The present invention contemplates 'means between the. detector and dog for relieving the, drop wire of such increased or injurious pressure by they detector,l and broadly considered', such means consists of the connections. between thedog and detector, as will be morev fully described.A v

The detector shaft 12 has extending therefrom an arm 39V to which is connected at 40 a rod 41 yieldingly associated'y with a lever in the train of connections between the detector and dog. As show-n.,l in the present instance, such connections comprise a Abell crank lever pivotally mounted at 42 ,.0 to a bracket 43 secured to the loom side, one

arm 44 of the bell crank lever being connected to a rodl or tranmsitter 45 which is joined to the arm 3'8 extending to the rock shaft` 24.. The other arm 46 of' the bell crank is yieldingly connected to` the rod 41, and in the present instance such arm 46 of thebell crank carries a sleeve or collar 47 pivotally mounted at 481 on the arm 46. The rod 41 passes through the sleeve 47 and is provided with the adjustable collars 49, one above, and theother below the sleeve 47. The collarsk 49` may be conveniently secured to the rod 41 in adjusted position bymeans of the set screws 50 or other convenient means, and between the collars 49 and the sleeve 47 are interposed the springs 51, one above and the other below the sleeve 47, the construction being such that thev sleeve 47 connected to the bell crank may have a yielding movement ony the rod 41 in either direction, whereby any turning movement of the dog 28 which may be transmitted tothe rock shaft 24 through the governor 25 will yieldingl'y act through the described means upon the detector and relieve the drop wire engaged thereby from injurious pressure.

Ordinarily the dog 28 is so contrived and positioned that when engaged by the bunter on the lay the central portion of the dog will contact with the-bunter and the dog be moved directly in a transverse direction relative to the shaft 24, but owing to the wear of the parts and inaccuracy of' adjiistment it may happen at times that the dog `will be engaged by the bunter a-t a point either abovev or below its longitudinal center, with the result that as the bunter' moves rearward the dog will not only be given its transverse movement relative to theI rock shaft but will be given a, turning movement which will be transmittedY through the governor to the rock shaft 24, and perforce impart to the detector increased pressure against the drop wire, should yielding means Iot be provided between the detector and c og.

Should the detector be arrested in the position indicated in Fig'. 1 and the dog he engaged by the bunter at a point above its longitudinal center, the bell crank lever carrying the sleeve 47 will be raised to thereby relieve the pressure of the detector against the drop wire, and it may in some cases impart suiicient movement to the detector to cause disengagement from the drop wire which has arrested its movement. This,

however, does not effect the loom stoppage,`

because the dog at such times has already been engaged by the, bunter; On the other hand, shouldY the dog be engaged by the bunter at a point. below the longitudinal center, then the turning movement of thc rock shaft 24 will be transmitted to the detector yieldingly, in the disposition of parts shown by Fig. 1, to avoid injurious crushing pressure of the detector against the drop wire.

From .the construction described it will be apparent that the present invention provides connections between the d-og and detector of a yielding nature to prevent injurious crushing pressure of the detector against a drop wire when the detector is arrested in its movement and the `dog itself has been engaged by the bunter at a point either above or below its-longitudinal center.

What is claimed is:

l. In a warp stop vmechanism for looms, the combination of a series of drop wires, Va detector, means for imparting detecting movement thereto, the lay having a bunter, a dogfor cooperation therewith, stopping means operated by the dog when it is engaged by the bunter, connections between the dog and detector independent of the operating means for moving the dog on each de- .tecting movement of the detector and arresting the dog for engagement by the bunter when the detector is arrested by a dro-p wire, and means in said connections for relieving the drop wire from injurious pressure by the detector due to movement of the dog by the bunter.

2. In a warp stop mechanism for looms, the combination of a series of drop wires, a detector, means for imparting detecting movement thereto, the lay having a bunter, a dog for cooperation therewith on backward movement of the lay, stopping means operated by the dog when it is engaged by the bunter, connections between the dog and detector for moving the dog on each detecting movement of the detector and arresting the dog for engagement by the bunter when the detector is arrested by a drop Wire, and means including a spring in said connections for relieving the drop wire from injurious pressure by the detector due to movement of the dog by the bunter.

3. In a warp stop mechanism for looms, the combination of a series of drop wires, a detector, means for vibrating the detector, the lay having a bunter, a rock shaft, a `dog on said rock shaft adapted to be engaged by the bunter on backward movement of the lay, stopping means operated by the dog when engaged by the bunter, connections between the rock shaft and detector for moving the dog on each detecting movement of the de tector and arresting the dog for engagement by the bunter when the detector is arrested by a drop wire, and yielding means in said connections between the dog and detector independent of the detector vibrating means for relieving the drop wire from pressure of the detector when said connections are moved by the dog due to the action of the bunter.

4. In a warp stop mechanism for looms, the combination of a series of drop wires, a detector, means for vibrating the detector, the lay having a bunter, a rock shaft, a dog on said rock shaft adapted to be engaged by the bunter, stopping means operated by the dog when engaged by the bunter on backward movement of the lay, connections between the rock shaft and detector independnections are moved by the dog due to the action of the bunter. r

5. In a warp stop mechanism for looms, the combination of a series of drop wires,a detector having a detecting movement and adapted to be arrested by a drop wire, a

bunter carried by the lay, a slidablymount-11 ed Adog in cooperative relation with the bunter, connections between the detector and dog for positioning the latter'for engagement by the bunter when the detector is arrested by a drop wire, `and yielding means in said connections for relieving the drop wire from injurious pressure of the detector due to movement of the dog after it has been engaged by the bunter.

6. In a warp stop mechanism for looms, the combination of a series of drop wires, a detector, means for vibrating the detector, a bunter carried by the lay, a dog for engagement by the bunter on backward movement of the lay, stopping means connected to the dog, a rock shaft on which the dog is mounted, connections between the rock shaft and detector independent of the detector vibrating means for moving the dog on each detecting movement of the detector and arresting the dog for engagement by the bunter when the detector is Earrested by a drop wire, such connections including a yielding member operatively connected to the detector to cushion the pressure of the detector against the drop wire when the rock shaft is turned by movement of the dog when engaged with the bunter.

7. In a drop wire mechanism for looms, the combination of a series of drop wires, a detector, means for imparting detecting movement thereto, a rock shaft, a dog connected to the rock shaft and having a movement towards and from the front of the loom, a bunter on the lay, stopping mechanism actuated by the dog when moved by the bunter as the lay goes back, an arm secured to the rock shaft, a lever for operating the arm and rock shaft, and yielding connections between the lever and detector independent of the detector moving means for relieving the pressure of the detector against a drop Wire when the rock shaft is turned by the dog due to the action of the bunter.

8. In a warp stop mechanism for looms, the combination of a series of drop wires, a detector, means for vibrating the detector, an arm connected to the detector, a rod eX- tending from the arm, a sleeve on the rod,

springs.l interposed-L between the sleeve and roel, a elog, the lay having abunter to. co-

operate with the clogv to effect. loom stoppage on ythe occurrence of afWai-p fault, and

connections between thel sleeve and dog for yieldingly controlling the position of the og.y

9.111 a` Warp: stop mechanism for looms,

they combination of the lay having a bunter,

a series of drop Wires, a `vibrating detector to engage and. bearrested by a drop Wire, a

lloiavotalliy andslvidably mounted dog to: cooperatev with the bunterP to effect loom stop- "page, an oscillating governor' connectecl to the dog, means connected' to thedetector for rendering thel governor effective. to positionl the d'og or engagement by the bunter on the occurrence of a Wal-'p fault, Said means. including a ro@ movable longitudinally by vibration of thel detector, and a yielding conneetion bet-Ween said rod and the governor to, relieve theV drop Wire of pressure When the: clogV is, moved pivotally by engagement with the bunter.'

10.. vIna Warp stop mechanism for looms, the combination of a Seriesof d'itopWi-res, a

l detector, meansy for vibrating the detector, a

rod moved longitudinally by movement of the detector, 'a sleeve loosely mounted on the rod, a spring on the rod at each side of.v said sleeve, means forv adjusting the action of said springs a lever connected to the sleeve, a rock. shaft7 av clogy on. the rock shaft,

`the lay having a bunter'for engagingl the 

